微信小游戏保存本地用户文件怎么存图片

我这边是截图整个屏幕然后保存到相册，你看下可不可以用！
`canvas.toTempFilePath({
x: x,
y: y,
width: cw,
height: ch,
destWidth: pw,
destHeight: ph,
success: (res) => {
wx.saveImageToPhotosAlbum(
{
filePath: res.tempFilePath,
success: function (res) {
console.log("succes", res);

                        },
                        fail: function (res) {
                            console.log("fail", res);
                        },
                        complete: function (res) {
                            console.log("complete", res);
                        }
                    }
                )
            }
        }
        );`